M1 CPU features

[Jason Liu]

Aha, hw.optional! That's useful, thanks Georges!

-- 
Jason Liu


On Mon, Apr 26, 2021 at 2:16 PM Georges Martin <jrjsmrtn at gmail.com> wrote:

> $ sysctl hw.optional | grep -E 'neon|armv8'
> hw.optional.neon: 1
> hw.optional.neon_hpfp: 1
> hw.optional.neon_fp16: 1
> hw.optional.armv8_1_atomics: 1
> hw.optional.armv8_crc32: 1
> hw.optional.armv8_2_fhm: 1
> hw.optional.armv8_2_sha512: 1
> hw.optional.armv8_2_sha3: 1
>
> Le 26 avr. 2021 à 19:55, Jason Liu <jasonliu at umich.edu> a écrit :
>
> On Mon, Apr 26, 2021 at 1:42 PM Christopher Jones <
> jonesc at hep.phy.cam.ac.uk> wrote:
>
>> Thats not at all surprising as those instruction sets are very much
>> specific to X86_64 systems.
>>
>> RISC processors, Arm, do have their own sets of SIMD instructions (e.g.
>> Neon), but they are entirely different to those on X86_64 machines.
>>
>> Whether or these are supported on Apple’s M1 processors I have no idea.
>>
>
> It looks like the M1 supports Neon SIMD instructions, but not SVE SIMD
> (which I guess is supposed to be similar to AVX?):
>
> https://discussions.apple.com/thread/252073619
>
> --
> Jason Liu
>
>
> On Mon, Apr 26, 2021 at 1:42 PM Christopher Jones <
> jonesc at hep.phy.cam.ac.uk> wrote:
>
>>
>>
>> On 26 Apr 2021, at 6:28 pm, Jason Liu <jasonliu at umich.edu> wrote:
>>
>> Thanks Arno :)
>>
>> I'm kind of surprised that the M1 doesn't seem to support any SSE or
>> AVX....
>>
>>
>>
>> Thats not at all surprising as those instruction sets are very much
>> specific to X86_64 systems.
>>
>> RISC processors, Arm, do have their own sets of SIMD instructions (e.g.
>> Neon), but they are entirely different to those on X86_64 machines.
>>
>> Whether or these are supported on Apple’s M1 processors I have no idea.
>>
>> Chris
>>
>>
>>
>>
>> Does "sysctl machdep.cpu.features" return anything?
>>
>> --
>> Jason Liu
>>
>>
>> On Mon, Apr 26, 2021 at 1:23 PM Arno Hautala <arno at alum.wpi.edu> wrote:
>>
>>> > On 26 Apr 2021, at 13:20, Jason Liu <jasonliu at umich.edu> wrote:
>>> >
>>> > sysctl machdep.cpu.brand_string ; sysctl machdep.cpu | grep -i
>>> "avx\|sse”
>>>
>>> $ sysctl machdep.cpu.brand_string ; sysctl machdep.cpu | grep -i
>>> "avx\|sse”
>>> machdep.cpu.brand_string: Apple M1
>>>
>>> --
>>> arno  s  hautala    /-|   arno at alum.wpi.edu
>>>
>>> pgp b2c9d448
>>>
>>>
>>>
>>
>
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